Re: hash table sizes

From: Anton Blanchard (anton_at_samba.org)
Date: 11/26/03

  • Next message: Bradley Chapman: "Re: Beaver In Detox AND IEEE1394 badness message" 
    Date:	Wed, 26 Nov 2003 18:25:53 +1100
To: Jack Steiner <steiner@sgi.com>

    > That was a concern to me too. However, on IA64, all page structs are
    > in the vmalloc region (it isnt allocated by vmalloc but is in the same
    > region as vmalloc'ed pages. They are mapped with 16k pages instead of
    > the 64MB pages used for memory allocated by kmalloc).
    >
    > Before switching to 16K pages for the page structs, we made numerous
    > performance measurements. As far as we could tell, there was no
    > performce degradation caused by the smaller pages. It seems to me that
    > if page structs are ok being mapped by 16k pages, the hash tables
    > would be ok too.

    OK, on ppc64 with a 4kB base pagesize Id be more worried about using the
    vmalloc region.

    Anton
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